Lecture 02a: Setting a context for us in the Universe
... Stars produce winds which churn and fertilize the ISM; Stars supernovae, further fertilizing the ISM. ...
... Stars produce winds which churn and fertilize the ISM; Stars supernovae, further fertilizing the ISM. ...
The Heliocentric Model of the Solar System
... • A light-year is the distance a beam of light travels in a calendar year. • The galaxy in the picture is about 100,000 light-years across, about the same as our Milky Way galaxy. For comparison the distance Earth-Moon is about 1.5 light-seconds • A light-year is equal to 10 Trillion kilometers ...
... • A light-year is the distance a beam of light travels in a calendar year. • The galaxy in the picture is about 100,000 light-years across, about the same as our Milky Way galaxy. For comparison the distance Earth-Moon is about 1.5 light-seconds • A light-year is equal to 10 Trillion kilometers ...
Some Basic Principles from Astronomy
... factor? I mean that the ratio of the brightness (where for our purposes flux F is a measure of the brightness) changes by a factor of 100 for every 5-magnitude change, or the flux ratio is F1 = 100(m2 −m1 )/5 F2 • There are a few things you should keep in mind here: ⊲ This is how bright things look ...
... factor? I mean that the ratio of the brightness (where for our purposes flux F is a measure of the brightness) changes by a factor of 100 for every 5-magnitude change, or the flux ratio is F1 = 100(m2 −m1 )/5 F2 • There are a few things you should keep in mind here: ⊲ This is how bright things look ...
1. Star A has a distance of 3 parsecs. What is its parallax angle? 1a
... A is brighter by a factor of 2.512 × 2.512. Cant say anything about how bright they appear. Stars A and B have apparent magnitudes of -2 and 0 respectively. WHich is brighter and by how much? Which appears brighter and by how much? Cant say anything about which is brighter but star A appears brighte ...
... A is brighter by a factor of 2.512 × 2.512. Cant say anything about how bright they appear. Stars A and B have apparent magnitudes of -2 and 0 respectively. WHich is brighter and by how much? Which appears brighter and by how much? Cant say anything about which is brighter but star A appears brighte ...
PSCI 1414 General Astronomy
... • Star system – A star and all the material that orbits it, including planets, dwarf planets like Pluto, and other small solar system bodies • Galaxy – A gravitationally bound system of stars, gas, and dust • Galaxy cluster (or group) – A collection of galaxies bound together by gravity • Superclust ...
... • Star system – A star and all the material that orbits it, including planets, dwarf planets like Pluto, and other small solar system bodies • Galaxy – A gravitationally bound system of stars, gas, and dust • Galaxy cluster (or group) – A collection of galaxies bound together by gravity • Superclust ...
Name
... 17. Explain the big bang theory in as much detail as possible. Make sure you answer the following questions: 1. Is the universe expanding or getting smaller? 2. What evidence did the WMAP provide scientists about the big bang? 3. Is the universe cooling or getting hotter? Less or more dense? 4. How ...
... 17. Explain the big bang theory in as much detail as possible. Make sure you answer the following questions: 1. Is the universe expanding or getting smaller? 2. What evidence did the WMAP provide scientists about the big bang? 3. Is the universe cooling or getting hotter? Less or more dense? 4. How ...
The universe
... Planets around the sun and the surrounding planets revolve around the center of the galaxy (Milky Way). ...
... Planets around the sun and the surrounding planets revolve around the center of the galaxy (Milky Way). ...
Goal: To understand the HR diagram
... • If we plotted all the stars from a single cluster what might we get? • First we should ask 2 questions: • 1) How do the distances from us compare to all the stars in the cluster (close to same, or not close)? • 2) How do the ages of the stars in the cluster compare? ...
... • If we plotted all the stars from a single cluster what might we get? • First we should ask 2 questions: • 1) How do the distances from us compare to all the stars in the cluster (close to same, or not close)? • 2) How do the ages of the stars in the cluster compare? ...
Heliocentric model
... can make are their positions relative to the Earth and the Sun – the planetary configuration – Inferior conjunction – between us and the Sun (a transit occurs when it is silhouetted against the Sun’s bright ...
... can make are their positions relative to the Earth and the Sun – the planetary configuration – Inferior conjunction – between us and the Sun (a transit occurs when it is silhouetted against the Sun’s bright ...
Stellar Parallax Problems
... B. The Milky Way galaxy has a diameter of about100,000 light years and we are about 28,000 light years from the center. In a sentence describe how much of the galaxy this hypothetical Gaia-copy mission could see (ignoring other factors like obscuration due to interstellar dust)? ...
... B. The Milky Way galaxy has a diameter of about100,000 light years and we are about 28,000 light years from the center. In a sentence describe how much of the galaxy this hypothetical Gaia-copy mission could see (ignoring other factors like obscuration due to interstellar dust)? ...
The Satellites of Uranus and Neptune: A New Astrometrie Programme
... Observations are now being obtained at La Silla of the outer planets Neptune and Uranus. In order to determine exact positions of the satellites of these two giant planets, Drs. G. Ratier and O. Calame of the Pic-du-Midi Observatory in the French Pyrenees have recently used the ESO 1.5 m telescope. ...
... Observations are now being obtained at La Silla of the outer planets Neptune and Uranus. In order to determine exact positions of the satellites of these two giant planets, Drs. G. Ratier and O. Calame of the Pic-du-Midi Observatory in the French Pyrenees have recently used the ESO 1.5 m telescope. ...
Using Parallax to Measure the Distance of Stars
... exercise, we investigate the use of the trigonometric or measured parallax method to determine distances. Even when observed with the largest telescopes, stars are still just points of light. Although we may be able to tell a lot about a star through its light, these observations do not give us a re ...
... exercise, we investigate the use of the trigonometric or measured parallax method to determine distances. Even when observed with the largest telescopes, stars are still just points of light. Although we may be able to tell a lot about a star through its light, these observations do not give us a re ...
Thought Question
... and other celestial bodies •Uses •Shape and formation of galaxies •Exoplanet detection Gaia, the newest European Space Agency astrometry mission ...
... and other celestial bodies •Uses •Shape and formation of galaxies •Exoplanet detection Gaia, the newest European Space Agency astrometry mission ...
Unit 1
... • Stars form in large groups out of a single interstellar cloud of gas and dust • These groups are called star clusters • Open clusters have a low density of stars – there is lots of space between the cluster’s members • They can contain up to a few thousand stars in a volume 14 to 40 light years ac ...
... • Stars form in large groups out of a single interstellar cloud of gas and dust • These groups are called star clusters • Open clusters have a low density of stars – there is lots of space between the cluster’s members • They can contain up to a few thousand stars in a volume 14 to 40 light years ac ...
The Size of the Universe (1920) Harlow Shapley Heber Curtis
... • Graphite • or Silicates (MgxFe1-xSiO3; Mg2xFe2-2xSiO4; etc) ...
... • Graphite • or Silicates (MgxFe1-xSiO3; Mg2xFe2-2xSiO4; etc) ...
Astronomy Lecture Notes: Stellar Nomenclature I Introduction
... 1. If one star is 1 magnitude brighter than another then that star is actually about 2.5 times brighter as measured in Watts/m2 by a photometer. 2. If one star is 5 magnitudes brighter than another then that star is actually exactly 100 times brighter as measured in Watts/m2 by a photometer. 3. Exam ...
... 1. If one star is 1 magnitude brighter than another then that star is actually about 2.5 times brighter as measured in Watts/m2 by a photometer. 2. If one star is 5 magnitudes brighter than another then that star is actually exactly 100 times brighter as measured in Watts/m2 by a photometer. 3. Exam ...
Part 2 Answer Key
... Star Clusters are multiple star systems bound together by the force of gravity. Star Clusters can be divided into two main groups. One group is called Globular Clusters. They contain many stars and gravity holds them tightly together. They swarm just outside the galaxy and form a halo or bulge. We k ...
... Star Clusters are multiple star systems bound together by the force of gravity. Star Clusters can be divided into two main groups. One group is called Globular Clusters. They contain many stars and gravity holds them tightly together. They swarm just outside the galaxy and form a halo or bulge. We k ...
Sep 2017 - What`s Out Tonight?
... tens of thousands stars held together by their mutual gravity. All Galilean moons and cloud bands, easily visible at 50x. It is posof the globulars that can be seen in the sky are part of our Milky sible to see the moons with well-focused binoculars. Saturn is Way Galaxy, and there are about 200 of ...
... tens of thousands stars held together by their mutual gravity. All Galilean moons and cloud bands, easily visible at 50x. It is posof the globulars that can be seen in the sky are part of our Milky sible to see the moons with well-focused binoculars. Saturn is Way Galaxy, and there are about 200 of ...
Homework Problems for Quiz 1 – AY 5 – Spring 2013
... a) What are the relative distances of the two stars? Star A has twice the parallax angle so is at 1/2 the distance of Star B b) what are the relative brightnesses of the two stars? Based on their relative luminosities, Star A would be twice as bright as Star B at the same distance. But, Star A is 1/ ...
... a) What are the relative distances of the two stars? Star A has twice the parallax angle so is at 1/2 the distance of Star B b) what are the relative brightnesses of the two stars? Based on their relative luminosities, Star A would be twice as bright as Star B at the same distance. But, Star A is 1/ ...
glossary - Discovery Education
... light-year — the distance a beam of light in a vacuum travels in one year, about 5.88 trillion miles. nebula — derived from the Latin word for “cloud,” a fuzzy patch of light in the night sky. Nebulae appear in many forms and are thought to be clouds of dust and gas, frequently the remains of explod ...
... light-year — the distance a beam of light in a vacuum travels in one year, about 5.88 trillion miles. nebula — derived from the Latin word for “cloud,” a fuzzy patch of light in the night sky. Nebulae appear in many forms and are thought to be clouds of dust and gas, frequently the remains of explod ...
The Heliocentric Universe
... calculate planetary orbit distances for the first time. D. placed earth at the center of the solar system and was the first to postulate that planets moved in epicycles. ...
... calculate planetary orbit distances for the first time. D. placed earth at the center of the solar system and was the first to postulate that planets moved in epicycles. ...
Astronomical Ideas Fall 2012 Homework 4 Solutions 1. Two stars
... massive stars that still burn H on the main sequence is a clock, because we know that the cluster needs to be old enough so that all of the more massive stars have already burned up all of their Hydrogen and left the main sequence. ...
... massive stars that still burn H on the main sequence is a clock, because we know that the cluster needs to be old enough so that all of the more massive stars have already burned up all of their Hydrogen and left the main sequence. ...
Ch. 13 GALAXIES
... i. Ceph’s that vary _________ are very bright ii. Short-period Ceph’s are _____ 6. RR Lyrae are more common, but not as bright (smaller _______) 7. Ceph’s seen in nearby _______ C. First Accurate Size & Shape 1. RR Lyrae are common in _________ clusters 2. Harlow ________ plotted cluster distributio ...
... i. Ceph’s that vary _________ are very bright ii. Short-period Ceph’s are _____ 6. RR Lyrae are more common, but not as bright (smaller _______) 7. Ceph’s seen in nearby _______ C. First Accurate Size & Shape 1. RR Lyrae are common in _________ clusters 2. Harlow ________ plotted cluster distributio ...
Cosmic distance ladder
The cosmic distance ladder (also known as the extragalactic distance scale) is the succession of methods by which astronomers determine the distances to celestial objects. A real direct distance measurement of an astronomical object is possible only for those objects that are ""close enough"" (within about a thousand parsecs) to Earth. The techniques for determining distances to more distant objects are all based on various measured correlations between methods that work at close distances and methods that work at larger distances. Several methods rely on a standard candle, which is an astronomical object that has a known luminosity.The ladder analogy arises because no one technique can measure distances at all ranges encountered in astronomy. Instead, one method can be used to measure nearby distances, a second can be used to measure nearby to intermediate distances, and so on. Each rung of the ladder provides information that can be used to determine the distances at the next higher rung.